|
|
Forums:
Climbing Information:
The Lab:
Re: [mattmaddaloni] The Anticam:
Edit Log
|
|
mattmaddaloni
May 13, 2010, 6:19 AM
Views: 15325
Registered: Mar 25, 2004
Posts: 26
|
Hello Alexfromithica, way to go on designing and building your device. It looks really cool. The range problem was definitely the biggest challenge for me and I needed it to expand quite a lot. The current device I have ranges from 0" to 8.5" which really made the difference in finding placements.
Also super cool to hear from Robdotcalm, thanks for showing support and great to hear a perspective from someone who was part of the Big Bro development, and of course a pioneer like Craig Luebben.
A couple of points to make note for those thinking about this...
1) a scissor does not have a large range. It can only create a large leverage force when the scissor arms are all the way open, the force significantly drops even at 3/4 open.
2) major issue is the size of arm and cam used behind the flake. If you make a bar with a wide T-beam flange it will either lever out the flake or just not fit. The stress analysis calculators in Autodesk Inventor allowed me to take material away from the flange until it was the smallest it could be and still withstand the force applied in a fall. A larger cam and or leveraged cam would also take up too much room and would not fit behind the flake.
3) if you make the outside cams big then the device loads unevenly and tests show that it will eventually rotate until it pops off or if stopped by the inside arm against the back wall will lever out the flake.
4) And finally, if the arms are not strong enough to stop flexing when loaded then you will need a hammer to take the device off... just like when you tighten a locking biner when hanging on it and can't undo it when your not.
So the constants are; small same size cams that load evenly, thin and non flexing t-bar flange and long arms to reach around feature.
In later posts I will explain the spring and barrel components so that anyone who wants to build version 2 can do so.
mm
(This post was edited by mattmaddaloni on May 13, 2010, 7:02 AM)
|
|
|
Edit Log:
|
|
Post edited by mattmaddaloni
() on May 13, 2010, 7:02 AM
|
|
|
|
|
|
